TL;DR: DVOL is Deribit's Bitcoin volatility index, the closest thing crypto has to the equity VIX. It reads the whole BTC options surface to produce one number: the market's 30-day forward-looking, annualized expected volatility, quoted in percent. It is a fear-and-uncertainty gauge, not a price forecast and not a directional signal.
What is DVOL?
DVOL is an implied-volatility index published by Deribit, the dominant venue for crypto options and now part of Coinbase following its 2025 acquisition. It distills the prices of Bitcoin options into a single number that represents the volatility the market is pricing in over the next 30 days, expressed on an annualized basis in percent.
The mental model is the same one equity traders use for the VIX. When option premiums are rich, traders are paying up for protection or for exposure to large moves, and DVOL rises. When premiums compress, DVOL falls. A reading of 60 means the options market is pricing roughly 60 percent annualized volatility for BTC over the coming month. There is also an ETH DVOL built the same way for Ether, so you can compare how much uncertainty the market assigns to each asset.
How is DVOL constructed?
The key detail is that DVOL is model-free. It does not take a single at-the-money quote and call that "the" implied volatility. Instead it integrates across the strike surface, a method borrowed from variance-swap pricing, so out-of-the-money puts and calls all contribute.
In practice Deribit selects the two listed expiries that bracket the 30-day horizon, one nearer and one further out, and uses the bids and asks across strikes for each. It discards in-the-money options and the deepest out-of-the-money tails (options with delta below roughly 5 percent), because those quotes are noisy and add little signal. The variance from each expiry is computed in variance-swap style, weighting out-of-the-money options by the inverse of the strike squared, then interpolated to a constant 30-day point and annualized. The output is one volatility number.
Why does the surface matter rather than a single quote? Because the shape of the surface carries information. Skew (puts pricing higher than calls, or the reverse) and the convexity of the smile tell you where the market expects risk. A model-free index captures the full distribution the options are pricing, not just the center.